feat: adds toby's custom classes (#570)

* feat(lesson-16): add Status enum

* feat(lesson-16): add custom exception InvalidOrderOperationException

* test(lesson-16): TDD tests for VideoProject custom type

* feat(lesson-16): implement VideoProject (enum, collection, constructor, loop, conditionals, custom exception)

* style(lesson-16): apply Spotless formatting to Lesson 16 files

Author: tobyev

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/tobyevans/InvalidOrderOperationException.java

@@ -0,0 +1,7 @@
+package com.codedifferently.lesson16.tobyevans;
+
+public class InvalidOrderOperationException extends RuntimeException {
+  public InvalidOrderOperationException(String message) {
+    super(message);
+  }
+}

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/tobyevans/Status.java

@@ -0,0 +1,7 @@
+package com.codedifferently.lesson16.tobyevans;
+
+public enum Status {
+  PENDING,
+  PAID,
+  CANCELLED
+}

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/tobyevans/VideoProject.java

@@ -0,0 +1,91 @@
+package com.codedifferently.lesson16.tobyevans;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VideoProject {
+  private String ownerName;
+  private List<String> clips;
+  private int totalSeconds;
+  private Status status;
+  private boolean monetized;
+  private int clipCount;
+
+  public VideoProject(String ownerName, boolean monetized) {
+    this.ownerName = ownerName;
+    this.monetized = monetized;
+    this.clips = new ArrayList<>();
+    this.totalSeconds = 0;
+    this.status = Status.PENDING;
+    this.clipCount = 0;
+  }
+
+  public void addClip(String name, int seconds) {
+    if (name == null || name.isEmpty() || seconds < 0) {
+      throw new InvalidOrderOperationException("Invalid clip");
+    }
+    clips.add(name);
+    totalSeconds += seconds;
+    clipCount = clips.size();
+  }
+
+  public void trim(int seconds) {
+    if (seconds < 0 || seconds > totalSeconds) {
+      throw new InvalidOrderOperationException("Trim out of range");
+    }
+    totalSeconds -= seconds;
+  }
+
+  public void publish() {
+    if (status != Status.PENDING) {
+      throw new InvalidOrderOperationException("Only pending can publish");
+    }
+    status = Status.PAID;
+  }
+
+  public void cancel() {
+    if (status == Status.PAID) {
+      throw new InvalidOrderOperationException("Cannot cancel after publish");
+    }
+    status = Status.CANCELLED;
+  }
+
+  public String getSummary() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("VideoProject{owner=")
+        .append(ownerName)
+        .append(", status=")
+        .append(status)
+        .append(", clips=[");
+    for (int i = 0; i < clips.size(); i++) {
+      sb.append(clips.get(i));
+      if (i < clips.size() - 1) sb.append(",");
+    }
+    sb.append("], totalSeconds=")
+        .append(totalSeconds)
+        .append(", monetized=")
+        .append(monetized)
+        .append("}");
+    return sb.toString();
+  }
+
+  public String getOwnerName() {
+    return ownerName;
+  }
+
+  public int getClipCount() {
+    return clipCount;
+  }
+
+  public int getTotalSeconds() {
+    return totalSeconds;
+  }
+
+  public Status getStatus() {
+    return status;
+  }
+
+  public boolean isMonetized() {
+    return monetized;
+  }
+}

lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/tobyevans/VideoProjectTest.java

@@ -0,0 +1,58 @@
+package com.codedifferently.lesson16.tobyevans;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+public class VideoProjectTest {
+  @Test
+  void addClip_increasesCountAndDuration() {
+    VideoProject v = new VideoProject("Toby", true);
+    v.addClip("Intro", 10);
+    v.addClip("Main", 20);
+    assertEquals(2, v.getClipCount());
+    assertEquals(30, v.getTotalSeconds());
+  }
+
+  @Test
+  void trim_reducesDuration() {
+    VideoProject v = new VideoProject("Toby", false);
+    v.addClip("A", 50);
+    v.trim(10);
+    assertEquals(40, v.getTotalSeconds());
+  }
+
+  @Test
+  void trim_tooMuch_throws() {
+    VideoProject v = new VideoProject("Toby", false);
+    v.addClip("A", 30);
+    assertThrows(InvalidOrderOperationException.class, () -> v.trim(40));
+  }
+
+  @Test
+  void publish_changesStatus() {
+    VideoProject v = new VideoProject("Toby", true);
+    assertEquals(Status.PENDING, v.getStatus());
+    v.publish();
+    assertEquals(Status.PAID, v.getStatus());
+  }
+
+  @Test
+  void getSummary_containsClipsAndStatus() {
+    VideoProject v = new VideoProject("Toby", true);
+    v.addClip("X", 5);
+    v.addClip("Y", 7);
+    String s = v.getSummary();
+    assertTrue(s.contains("X"));
+    assertTrue(s.contains("Y"));
+    assertTrue(s.toLowerCase().contains("status"));
+  }
+
+  @Test
+  void cancel_afterPublish_throws() {
+    VideoProject v = new VideoProject("Toby", false);
+    v.addClip("A", 10);
+    v.publish();
+    assertThrows(InvalidOrderOperationException.class, v::cancel);
+  }
+}